A
Apple Pie
Guest
ah okay thanks for the advice there mateWhat did Tarzan say when he saw a herd of elephants in the distance?
"Hey, look - a herd of elephants in the distance."
What did Tarzan say when he saw a herd of elephants in the distance wearing sunglasses?
Nothing, he didn't recognise them.
Ask him a riddle or joke type construction that doesn't have a punchline, then don't provide the answer. He will sit waiting for the answer in a state of, as the original question says, suspense, without ever hearing the end of the joke/riddle.